The best advice I can gie you is that you need to solve the issue that appears when you merge images with videos. Let me be clearer with this: if you use the merging effect (for intros and outros) and you use this option when you marge the last part of the video with a new image placed at the end of the same video, the moment when the video is blurring and the image appears, you can see half of the image on the top of the screen, and half of the video on the bottom of the screen. This only happens when you use this option at the end of your work,

It´s a pleasure that Windows Movie Maker is really easy to use. What I mostly love about this free software is that it allows me to drag and drop pieces of videos that I have inside it, and then it lets me edit them and join them easily. I also love the upper menu that allows me to add text, music, and even effects (such as HQ video image and Black and White "textures"), by only clicking once on the desired option. I really think that editing videos is super easy when I use Windows Movie Maker.
There are tons of in-program effects such as transitions, titles, credits, captions and even included audio scores, meaning you won’t get held up at any step of your editing process. There are panning and shift capabilities, high-quality post-processing zoom, as well as a plethora of color filtering plugins to give you the look you’ll need, even if the raw footage isn’t quite there. You’ll have the ability to export your movies in up to 4K resolution, and the software even supports 360-degree video projects. It’s a great powerhouse for beginners.
This open-source software program runs smoothly with Windows 10. It has a very user-friendly interface makes navigating the program easy for those with a little experience in video editing. Your files can even be extended using third-party video filters and it supports batch processing which means it is possible to handle multiple videos at the same time. Unfortunately, even with its friendly interface, this program can be a little difficult to understand for beginners.
Hay un par de cosas que no me gustan tanto: lo primero es que algunos videos cortos (menos de un par de mega bytes) pueden retrasar el software, y te llevará mucho tiempo. para terminar de subirlos a Windows Movie Maker. Por ejemplo, a veces, cargo un video corto para editar, y está listo en unos segundos. Pero luego, cargo otro video más corto para editar, pero esto lleva mucho tiempo para estar listo. Lo último que no me gusta es que el software deja de funcionar algunas veces.